For Wild camping best bits of kit... Hammock and Tarp
In my experience of cooking out doors, there is a lot of good kit out there, the best one in my opinion would be the MSR Whisper Light, its a multi fuel stove that will use petrol, diesel, paraffin, and gas, you can get a chinese copy for about 1/4 the price I have got friends that have these, and like them, and they seem to do a good job.
Jet boils expensive to buy and run, ok for the odd cup of hot water, yes it is very fast but that comes at a cost. Oh yeah very limited fuel options.
Kelly/Gillie Kettles are again expensive to buy, limited use, Limited fuel, ie wood, heavy/bulky even the small F1 is quite large, not really good unless car camping due to weight/size, I have used the cooking kit for the Kelly/Gillie Kettle but found these to be a pain while refuelling with sticks
For a all round bit of kit Swedish Army Trangia, boils water quite quickly, if you just want a mug, runs on meths, can use with Hexi, Wood, and if called for a small gas burner, the Cooking pot and lid can be used in a fire, and the the lid turned upside down and the pot and lid can be used as a Dutch Oven., bomb proof, but slightly heavy then the Trangia.
If you want hot water for a drink just keep a flask with hot water, use that while you wait for the water to boil, then refill the flask. I do this in the morning, by filling a small flask with coffee, the first thing when I wake up I get a Hot drink, no waiting... some times dont even get out my pit
If I Am Car camping tend to take a Gridle/kettle/Billys/Dutch Oven. and Make a tripod.
These are only my opinions, formed what I have found out in the field.